There's not a lot to say but 'good results' aczraad !
You've learned the drill...different bullets with different powders, vary the COAL ...Each rifle has it's personality.
I've tried loading to just off the lands but my rifle likes some space, can't exactly explain it,it just does.
Like you, my most accurate loads are not the hottest possible...in the 223 I use Barnes and Varget...for sure other bullets may not do as well with Varget, or Varget not so well with Speer, etc...but each bullet will have a 'best accuracy' with whatever powder you choose.
It may just not be the most accurate that bullet can do with another powder but so what, you've found good groups with your recipes, 1/2-3/4" is darn good shootin'.
I use Varget cause I got so much of the darn stuff I'll burn my supply down before making another purchase.
My 36gr Barnes VG loads with a COAL of 2.225 are mid-level at 3400 fps but it'll shoot 1" at 200 yards as long as I have the stamina to hold still so I'm done looking for better results.
If I find a ball powder that shot as well I'll most likely change, would love to have it run through the meter cleanly without cracking sticks.
If you don't have one get yourself a chronograph. Running your loads for velocity can be an eye opener compared to published numbers.